7. A national survey is conducted to assess the association between hypertension

Question

7. A national survey is conducted to assess the association between hypertension and stroke in persons over 55 years of age. Development of stroke was monitored over a 5 year follow-up period. The data are summarized below and the numbers are in millions.
Developed Stroke Did not Develop Stroke
Hypertension
12
37
No Hypertension
4
26
a) Compute the incidence of stroke in persons over 55 years of age
b) Compute the relative risk of stroke comparing hypertensive to non-hypertensive persons
c) Compute the odds ratio of stroke comparing hypertensive to non-hypertensive persons

Explanation / Answer

a)

incidence of stroke in persons over 55 years of age = 12+4 = 16

b)

Probability of stroke with hypertension = 12/16

Probability of stroke with No hypertension = 4/16

relative risk = (12/16)/(4/16)*100= 300%

that is 3 times more risk than no hypertension...

c)

Odds Ratio = (12/4)/(37/26) = 2.108

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